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Why is my craftsman snow blower running inconstantly and surging rpm ?

My craftsman snow blower model no. 247.886911 surges and struggles to maintain rpm. I started it for the first time this winter and it ran full throttle and was stuck there. I shut it off and restarted it a few minutes later and it then ran at the correct rpm but only for 15 seconds before surging. I drained the fuel system, cleaned the carburetor, replaced and gaped the spark plug, and filled with fresh gas. It starts great but begins to surge after 15 seconds every time. It also runs worse as i turn from choke to run position. I tried blowing a little snow with it and it ran at a more stable rpm under load. The service manual does indicate a cause of this may be over-governed engine. If i hold the arm on the governor in place it runs smooth. Does anyone have any solutions on how i can determine if it is still a carburetor issue or a governor issue?

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Craftsman , Electric Snowblowers , Snow Removal Equipment
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5 Answers from these members:
Mark T
Dan,
Thank you for posting what you did to fix the snow blower. I am sure others will take you advice if they have the same problem. To avoid this problem in the future I recommend using a fuel stabilizer in all the fuel you put into the tank. This will prevent the fuel from going bad and fouling up the new carburetor.
Thank you for using Manage my life.
Mark
by Mark T Earned 1,607 community points in Craftsman
January 20th, 2013
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Manage My Life
Hey experts, thanks for the advice. However after cleaning and reassembling the carburetor twice the engine still didn't run correctly. Instead of ordering a carburetor rebuild kit i decided purchase a new carburetor. I installed it and the engine runs great. The engine runs like it is brand new. So there was definitely something wrong with the other carburetor. The diagrams and links you provided were very detailed and useful.

Thanks again
Dan
by Manage My Life
January 17th, 2013
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Mark T
Here are the images.
by Mark T Earned 1,607 community points in Craftsman
January 14th, 2013
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Mark T
Thank you for your question.

I am sorry you are having a problem with the snow blower. By the symptoms you are having I suspect the problem is dirty passages in the carburetor. When the passages start to plug up the engine does not get the needed fuel to run smoothly. Then when you choke the engine, it delivers more fuel and the engine will smooth out. To cure the problem I recommend cleaning the main jet in the carburetor. You will need to purchase a can for carb cleaner from the local auto parts store. Then click on the following link to watch a video on how to clean the carburetor.

How to clean snow blower carburetor



The engine is not the same but it will give you an idea on how to do this. I have provided you with an image showing the break down of the carburetor.

Please use extreme caution when dealing with fuel.

Then after you have cleaned the carburetor, start the engine and slowly turn the choke off.

Please let me know if you have any other question on this problem.

Here is a link to order any parts you need.

Sears Parts Direct

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If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:

Sears Home Services

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Thank you for using Manage my life.

Mark T.
by Mark T Earned 1,607 community points in Craftsman
January 14th, 2013
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Managemylife.com is always a great resource to find the answers to just about anything. Your expert will research your question and respond within two business days but usually sooner. Have a great day!
by Manage My Life
January 12th, 2013
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